Final answer:
Condition and convention involve the movement of energy, as in the case of electromagnetic waves. Electromagnetic waves can travel through a vacuum with no need for a physical medium, and the movement of particles is not applicable in a vacuum since there are no particles to move.
Step-by-step explanation:
Condition and convention involve the movement of energy, the movement of electromagnetic waves. Electromagnetic waves, such as light and radio waves, do not require a physical medium to propagate; they can travel through a vacuum at a constant speed, commonly denoted as c, which is approximately 3 × 108 m/s. In contrast, mechanical waves, such as sound waves, do require a medium to travel through. The distinction between mechanical waves and electromagnetic waves also extends to the behavior of particles in different conditions. For example, in a medium, particles may move up and down (transverse wave) or back and forth (longitudinal wave) as the wave passes through. However, in a vacuum where electromagnetic waves can travel, particles do not move right and left because there are no particles in a vacuum to exhibit such motion.